微米级微波测距系统时延稳定性的测试研究

Test and research on time delay stability of micron microwave ranging system

微米级微波测距系统是低低卫-卫跟踪重力探测卫星的核心载荷,是反演地球重力场的主要数据来源,星间距离变化的测量精度达微米量级,对系统有源组件的时延稳定性要求非常高,搭建了时延稳定性测试系统,对有源组件进行时延稳定性地面测试验证,得到微米级微波系统有源组件的时延稳定性系数为19.02μm/K,结合无源组件的时延稳定系数及卫星轨道的温度环境,证明轨道谐波误差满足设计要求,微米级微波测距系统的距离变化测量精度满足研制需求。

The micro microwave ranging system is the key load of the low and low satellite tracking gravity detection satellite,and is the main data source for retrieving the earth's gravity field.The measurement accuracy of the inter satellite distance variation reaches the order of micrometer,which requires very high delay stability of the active components of the system.In this paper,a time delay stability test system is built to verify the time delay stability of active components.The time delay stability coefficient of active components in micron microwave system is 19.02μm/k.Combined with the time delay stability coefficient of passive components and the temperature environment of satellite orbit,it is proved that the orbit harmonic error meets the design requirements,and the range change measurement accuracy of micron microwave ranging system meets the development requirements.